Furnace



H. SEIDL FURNACE Feb. 14, 1928.

Filed July '7. 1927 INVVENTOR BY J r I r ATTORNEYS Patented Feb. 14,1928.

UNITED STATES nasal-7e PATENT orricie.

HUBER)? SEIDL, OF OBER-I-IAUSEN, GERMANY, ASSIGNOR TO THE BABGOCIEI. 85'WIIiCOK GOMPANY, F BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FURNACE.

application filed July 7, 1927, Serial No.

This invention relates to a furnace that is especially useful as aboiler furnace, and will be understood from the description inconnection with the accompanying draw ings in which Fig. 1 is a verticalsection, partly broken away, of an illustrative embodiment of theinvention, and Fig. 2 is a section along the line 22 of Fig. 1.

In the drawings, reference character 5 indicates the walls of a furnacethat may be lined with highly refractory material in the usual way. Asash-pit is provided at the lower portion of the furnace with a slopingfloor 6 and with a door 7 for removing the ashes. It has been found,especially with furnaces in which powdered fuel is burned, that when thedoors are opened in order to remove ashes from the ash-pit, the suddendraft of cold air that enters interferes with combustion. By the presentinvention, this objection is overcome, so that combustion is keptsatisfactory even when the ashes are being cleaned out.

A row 8 of water tubes that are slightly inclined to the horizontalextends across the lower portion of the furnace above the ash pit andthese tubes are connected to an inlet header which are located outsideof the furnace walls and are connected, as by tubes 11 and 12, to thecirculation system of the boiler. The inlet header 9 may be providedwith a valved drain pipe 13. I The tubes 8 are surrounded by longsleeves 15 that extend through one wall of the furnace and are revolubloupon the tubes 8. 'The sleeves 15 are provided with wings or plates 16on opposite sides that extend across the furnace and are wide enough tooverlap each other when the sleeves are turned into one position. Eachsleeve may be provided with a bearin 17 at one end thereof in one wallof the furnace and is provided with aworm wheel 18 at the other endoutside of the furnace. The worm wheels 18 mesh with a worm 19 that maybe turned by anyconvenicnt means so as to cause the wings 16 to assumedifferent positions.

A second row of slightly inclined tubes 20 may be located above the row8 and in proxiniity to the same, these tubes 20 extending from an inletheader 21 to an outlet header 22, both of which are located outside ofthe 9 and an outlet header 203,900, and in Germany March 17, 1926.

furnace walls and are connected to the circulation system of the boilerin any con venient manner.

The operation is as follows: In the nor mal operation of the furnace,the sleeves carrying the wings 16 are turned by means of the worm l9 andgears 18 so that they will assume the positions shown in full lines inFig. 2, thus permitting slag and ash to descend between the wings andcollect at the bottom of the furnace upon the sloping floor 6. The watertubes aid in protecting the wings by cooling the ash and slag as theydescend between these tubes and the water tubes 8 also cool the sleeves15 and the wings 16. Yfhen it is desired to clean out the ashes andslag, the sleeves 15' are turned to bring the wings 16 into thedottedline positions shown in Fig. 2, so that when the door 7 is opened,there will not be an inrush of air tl'irough the ashpit into thecombustion space of the furnace.

I claim:

1. In a furnace, water tubes in said furnace, a row of rotatable plateslocated above the ash-pit of said furnace, insane for turning saidplates so as to close the space above said ash-pit, said plates beingmounted upon said tubes, and water tubes above. said plates in proximitythereto.

2. In a furnace, a row of rotatable plates located above the ash-pit ofsaid furnace, means for turning said plates so as to close the spaceabove said ash-pit, and a set of water tubes above said plates betweenthem and the combustion space of said furnace.

In a furnace for burning powdered fuel, a row of water tubes spacedapart and extending across the furnace above the bottom thereof toproduce a cooling zone in the lower portion of the furnace chamber,connections whereby cooling water may be circulated tlrough said tubes,and closure plates each rotatably mounted on one of said water tubes andarranged to be positioned vertically in the normal operation of thefurnace and to be rotated to close the spaces between said water tubesto prevent passage of air into the furnace chamber above said tubes whenthe space below the tubes is opened to the air.

HUBERT SEIDL.

